fix: Use absolute import in __main__ for pyinstaller/pyinstaller#2560 (IDFGH-14380)

[nebkat]

Description

Fix for pyinstaller/pyinstaller#2560

Allows PyInstaller binaries to be generated using:

pyinstaller --onefile --name esp-idf-monitor esp_idf_monitor/__main__.py

Related

See also #20

Checklist

Before submitting a Pull Request, please ensure the following:

• 🚨 This PR does not introduce breaking changes.
• All CI checks (GH Actions) pass.
• Documentation is updated as needed.
• Tests are updated or added as necessary.
• Code is well-commented, especially in complex areas.
• Git history is clean — commits are squashed to the minimum necessary.

[github-actions]

	Warnings
⚠️	The PR description looks very brief, please check if more details can be added.

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